121100055 has 8 divisors (see below), whose sum is σ = 193760112. Its totient is φ = 64586688.

The previous prime is 121100051. The next prime is 121100069. The reversal of 121100055 is 550001121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121100055 - 2² = 121100051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 8073337 = 121100055 / (1 + 2 + 1 + 1 + 0 + 0 + 0 + 5 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4036654 + ... + 4036683.

It is an arithmetic number, because the mean of its divisors is an integer number (24220014).

Almost surely, 2^121100055 is an apocalyptic number.

121100055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121100055 is a deficient number, since it is larger than the sum of its proper divisors (72660057).

121100055 is an equidigital number, since it uses as much as digits as its factorization.

121100055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073345.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 121100055 is about 11004.5470147571. The cubic root of 121100055 is about 494.7450375579.

Adding to 121100055 its reverse (550001121), we get a palindrome (671101176).

The spelling of 121100055 in words is "one hundred twenty-one million, one hundred thousand, fifty-five".